Novel inorganic binary mixture for low‐temperature heat storage applications |
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Authors: | Yana Galazutdinova Mario Grágeda Luisa F Cabeza Svetlana Ushak |
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Affiliation: | 1. Department of Chemical Engineering and Mineral Processing and Center for Advanced Study of Lithium and Industrial Minerals (CELiMIN), Universidad de Antofagasta, Antofagasta, Chile;2. GREA Innovació Concurrent, INSPIRES Research Centre, Universitat de Lleida, Lleida, Spain |
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Abstract: | In this study, an inorganic mixture based on bischofite (industrial by‐product) was developed and characterized for its application as a phase change material for low‐temperature thermal energy storage. The most appropriate composition was established as 40 wt% bischofite and 60 wt% Mg(NO3)2 · 6H2O. Thermophysical properties were defined and compared with those of the mixture with synthetic MgCl2 · 6H2O. The heat of fusion and melting temperature were measured as 62.0°C and 132.5 kJ kg?1 for the mixture with MgCl2 · 6H2O and 58.2°C and 116.9 kJ kg?1 for the mixture with bischofite. The specific heat capacity values, cycling, and thermal stability for both mixtures were also determined. For the mixture with MgCl2 · 6H2O, the densities of the solid and liquid states were 1517 kg m?3 (ambient temperature) and 1515 kg m?3 (at 60‐70°C), respectively. For the mixture with bischofite, the densities of the solid and liquid states were 1525 kg m?3 (ambient temperature) and 1535 kg m?3 (at 60‐70°C), respectively. Both mixtures show supercooling of about 23.4 and 34.1°C for the mixture with bischofite and MgCl2 · 6H2O, respectively. In addition, it was shown that supercooling may be reduced by increasing the quantity of material tested. Thereby, it was established that an inorganic mixture based on bischofite is a promising PCM for low‐temperature thermal energy storage applications. |
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Keywords: | phase change material salt hydrate mixture thermal energy storage waste or by‐products |
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